<template>
    <div class="upload-container">
        <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini"
                   type="primary" @click=" dialogVisible=true">
            upload
        </el-button>
        <el-dialog v-model="dialogVisible">
            <el-upload
                    :multiple="true"
                    :file-list="fileList"
                    :show-file-list="true"
                    :on-remove="handleRemove"
                    :on-success="handleSuccess"
                    :before-upload="beforeUpload"
                    class="editor-slide-upload"
                    action="https://httpbin.org/post"
                    list-type="picture-card"
            >
                <el-button size="small" type="primary">
                    Click upload
                </el-button>
            </el-upload>
            <el-button @click="dialogVisible = false">
                Cancel
            </el-button>
            <el-button type="primary" @click="handleSubmit">
                Confirm
            </el-button>
        </el-dialog>
    </div>
</template>

<script>

export default {
    name: 'EditorImage',
    props: {
        color: {
            type: String,
            default: '#1890ff'
        }
    },
    data() {
        return {
            dialogVisible: false,
            listObj: {},
            fileList: []
        }
    },
    methods: {
        checkAllSuccess() {
            return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
        },
        handleSubmit() {
            const arr = Object.keys(this.listObj).map(v => this.listObj[v])
            if (!this.checkAllSuccess()) {
                this.$message('Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!')
                return
            }
            this.$emit('successCBK', arr)
            this.listObj = {}
            this.fileList = []
            this.dialogVisible = false
        },
        handleSuccess(response, file) {
            const uid = file.uid
            const objKeyArr = Object.keys(this.listObj)
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    this.listObj[objKeyArr[i]].url = response.files.file
                    this.listObj[objKeyArr[i]].hasSuccess = true
                    return
                }
            }
        },
        handleRemove(file) {
            const uid = file.uid
            const objKeyArr = Object.keys(this.listObj)
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    delete this.listObj[objKeyArr[i]]
                    return
                }
            }
        },
        beforeUpload(file) {
            const _self = this
            const _URL = window.URL || window.webkitURL
            const fileName = file.uid
            this.listObj[fileName] = {}
            return new Promise((resolve) => {
                const img = new Image()
                img.src = _URL.createObjectURL(file)
                img.onload = function () {
                    _self.listObj[fileName] = {
                        hasSuccess: false,
                        uid: file.uid,
                        width: this.width,
                        height: this.height
                    }
                }
                resolve(true)
            })
        }
    }
}
</script>

<style lang="scss" scoped>
    .editor-slide-upload {
        margin-bottom: 20px;

        :deep .el-upload--picture-card {
            width: 100%;
        }
    }
</style>
